Filter astats
  Show time domain statistics about audio frames.
    Inputs:
       #0: default (audio)
    Outputs:
       #0: default (audio)
astats AVOptions:
  length            <double>     ..F.A.... set the window length (from 0.01 to 10) (default 0.05)
  metadata          <boolean>    ..F.A.... inject metadata in the filtergraph (default false)
  reset             <int>        ..F.A.... recalculate stats after this many frames (from 0 to INT_MAX) (default 0)


